Key_PracticeFinal_Fall2008

Key_PracticeFinal_Fall2008 - CHEM 171 PRACTICE FINAL - FALF...

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Unformatted text preview: CHEM 171 PRACTICE FINAL - FALF - PAGE 2 l. (12 points) Circlethc species wimmeindicatcdpmpetty. a. myuestkcarbon-carbon bond order: cw Diamond Graphite I b. Molecule with i symmuy element: A1F3 SiF4 PF5 cn=7 ' c. Mostlikclytoappeardeep gun: /. d7- 0;, (h.s.) d5 - 0h (1.s.) d5 - Td d. Most exothermic process: i Cu+--> Cu+2 Cu —> Cu” Q 0 ———> 0‘2 e. co orbital that is most like carbon (note: carbon nucleus is on the lefi): Q f. Highest melting point: SiF4 SiC14 Sim4 CHEM 171 PRACTICE FINAL — FALL PAGE 3 ' 2. (12 points) Predict and draw the stmcnne, indicate bond angles. formal change (if any) and identify the point groups for the following molecules: cl 5‘ (e‘ P ”' F 1.41- n ‘ n..- 34‘ b. XeOFz x: ~Pe“ ‘ .vo 1F It a"; : " {.27 fr: -'~ " L c. 15’ (note: exception to VSEPR Rules) m. a. / 624/ ' If] :OtFI\ [$1 KI: (a d. Bent’s rule states that more electronegative substimetttsagefet hybrid orbitals with less a character. e Explain howthismle appliesto of ' stmctm-es v . e . ~ 1'». x2 0!: “fitjmwoca qxI-d fan-Hp) '0‘. fl) 41?- 1,0141th «mini; 00 I. chanéfi/I 1 0 out in My, “an” qwiwl 5’0; [MIAMI- 3. points) dioxide exists in a diffetent standard state than either isoelectronic carbon disulfide or slhcon dionde. Explain the differences in standard state by discussing the structural differences between threeet'nnpcmnds. I f - ' ‘ ‘ i . ; J! b 3““.5 I'd" +‘7O'AIV Nc'Ax Aer CD 1 CO). (L; flvquJo/ W44“; 54:]. Inn ‘4 cl m‘l‘ V97./1)¢?Jla‘lg 4.! #44 Mag 1‘3 «146.! (47 [(9 4-]- vc~/ [wimrzhvffififlw “led (M Exec-{J U 30;. i am :1er MWC. gamut CHEM 171 PRACTICE FINAL — FALL PAGE 4 4. (19points)Onmefonofingmdeaflxmfimldiagtmmdicmfiwmnlabimbmdhbdeechmeflufigmd mammalsmdfllemolectflarorbimlswiflupmopdatehbels. andofledlinestoindicatewhueme moleexflarabitalsemfmm. Fifiinmeappuopdmnumberofelecuonsfmthecomplex [Mn(en)2(HzO)7J3+ where en = ethylene dimmine. .— —— ,fi? .4 ' " f —" -- ~73 \ \ 3 ~--." \ \ s x ) ’ofi— —- ej + :>\ ' \é\\ +5 + +— +—'-=;;-+ -’I- up” w |‘\ ' I ’ ‘ 1% tin - ‘Q-‘flr 17; "1:41;. .1, "half, (174' ‘ 17—" I) ovlr’dU ’" 'ML 7 b. From your diagram calculate the average Mn-ligax‘ad bond order. 12.! - N -' 6' n—ijw 0.9 MM» (lb/W/W/Lm! :— "' 7- ‘ , a nag/CW . Ich bs'tutedf Mnhw uld di be ted? ' . c 3::ng «3er r011“ +3 Wtfifavlfr Wu“ fun/"d 3‘ ‘71“ U Jel‘vlJawl A 7th 1:1)!" and fit aim/w 102/ lav/fin. d. If6iodides were subsfi i «the ligands how would your 'agrambe affected? 11:. MVP (cc :9 rm]: {L I—fvtb an! !. Jffl'fl‘ A. C‘ l e. IféCO’sw su 'tuted fortheotherligands, how wouldxheMD. diagrambeaffected? ‘ 11‘” W) (wait. )0“! If («AL—WU [mug 43y} Ind/wig A lead») +0 a low I’M emf/9X. f. an‘all possible isomers of [Mn(en)2(H20)2]3+. a; T K/ I“ \ /""7v'z°\ / “HQ HAW "Ir a: LU W +Wj r .eMV‘J'IM U CHEM 1_71 PRACTICE FflAL — FALL . yAGE 5 . ' 5. (lOpoints)Drawdiagmnstoshow: a Theatbitalsinvolvedwhenfluodnebondstoau'ansifionmeml. :F’ all/Mk! t” 4”“ 1‘" ’1 W- 3;: F- 4M” ¢~ {3/3” 0 n/IM,—>d(+.7mwlufl b. Theorbitals involved when P(C6H5)3 bondstoatransition metal. ear 0-: Pia-«paw Mir/0H q 0f 77... Me - almflx I ‘11? ' M d h a, / ‘ . I c. Free ethylene (C2114) has an infrared absorption at 1650 cm'l. Explain why the C=C inflated stretching frequencyis~1500 cm'1 in auansition metal-emylene comp . 6 I . : dud! ’Jnal I"! 2M0 ’5“ ea: 4;; 2de 404le {14.1% in ma: I, 0 ' ' r} c w czc 0‘4 J 7% a Hat} Malc kroifa mu“, ‘7 an r 6. (12 points) The colors of lanthnnide imam” marin from f-f electronic transitions. Do you expect diese ions to be intensely or weakly colored? Why? Name m lanthanide ions expected to be colorless. Put these four lanthanides in orderof size from largetos . V, F4 MM rim] an, m1}! 144th and -- Mal. (c f? “‘43 +1. 4 1’3 T5“ 2 (or: > 6.5” 7 (e 7. (10 points) Cobaltal) tetrachloride is an intense blue solid. 0n exposure to air (or moiSture) it tums to a light red solid. This process can be reversed by heating to 2 100°C. _ _ . Hr " - it Use crystal geld!) arguments to explain these phenomena. a ’{W/ [dc/7] » 0+ 4 m Li. Magma +4 ( AA 4, . . “rat, Ton of 0k “A “kW/w (ii/VI! 2‘4"?) 54/! «(W (:13...- b. Whatapphcauon couldthis cobalteompl beusedfor? ' 1 . . . I t”; _ Wattle" [Mlldk’l/ CHEM 171 PRACTICE FINAL - FALL PAGEG . (25 points) Short Answers: 0‘ - ' '2 Wk '2 “"7 ' - a. Whatcolorrseachofflrefonowrng y fill “(NH/m“: (HH- ., Q‘dey i.asinglecxystalofsfliwn- I‘M} ’9 "' ' ,uAJ-j (Jena M- ii.a wderof ‘ a]! Po «ML ‘14] A,“ {(QHIW4 ‘ p41, iii.asinzlecrystalofsilica. 502 I‘llfllt'LV 6,8“, (A, um“; (1,1141 1M) . («qt 9 iv. a powder of silica. n, afifl'fl‘lm lag”! . Wh doesKMn l i '0] 1 7 n v b y and'fifm $33: ["141 Anne {vhf-Fey U /a/.(yd(l}va ripe“! and M ‘9 of °- Why“ [W2C131’4 dimmgnetic? wt? J? 41¢" eel 5'64“ M I \ d. Draw a picture showing a linear combination‘cif tvéo to produce one molecular orbital containing two nodes. Q ’9 9+8=>IQQ7P¥ e. Give an exp a‘fiafion the difference is observed rate constants for the following two reactions: [V(H20)6]+3+Cl' --) [V(HZO)5CI]'*'2 + H20' Kgq=106M'lsec'l [V(H20)6]+2+C1- -—» [Va-I20)5C|]+ + H20 Keq+10- lesec-l I My II"3 dL "’ Iota/c 0m qyxuh.‘ mc mm. {‘7 Ir I A” J.- - r *9— ~— V’ 94+ 11 Mer f. Determine all possible cln electron configurations for octahedral structures with a z—out distortion. ,. w! -; d?- ’(lu. " j a. 43L 1) J j.) 6’ ( JI. g. Determine all possible d“ electron configurations for tetrahedral structure with a.z-out distortion. .. -u “#4 *2.“ or, ha. 121% , 3 =1 .. a J ' v— (21,05) :_ CHEM 171 PRACTICE FINAL — FALL ' “ Juan: 7 . (16 pummDeflmnineflnaymlfiddmbifizafimenergyGncludingdimfimifm )ofthefollowing 3 molecules. Alsodetzrminethepointmxpancluding dustorlionsdfany) forcachmoeafle. Whydothese complexes obeyordiaobeythe l8-electronmle? a. ‘4 d 7 12-044 I 0 A59 . 4451— 4 a“; 1,541”, (FIE 2. 31—1415}; L(3/ré) +Ll’ - 7(Y351)* ((27,563 : V‘Vrb " Vsr‘l‘uo ' 11c” a/mn‘h‘V "£11244 [7&4 C m! 114ml 7" y-Md 11- CrlCGHd[P(CH3)3]3 11—12.!“ fa-U’llc (y‘l-L "" .‘. ,1» CE) 54/ aunt (ll/£9 ((-VrQiJf Cr\ ’ A. / Ea ’1- ((7:1le 3' Jllrd 1"” I (l Q\ C. Mo[(NH2CH2CH2NI-I7)2(NH3)2]+2 N’ [.1 ' "" o . 4% .33 ” fl/N (him t: I -—' {I LMW". y (“MK”) WA w _ /° NJ»..ka L f. 1.1. lb,h_ [my]! . '4 J’WM/ [L Cull/laud ' a. We», 0 fue- KL an“ 41le W'le O «a AJH [C'— flmc CO LI 0 \/ I (0 (Cl ‘ owflll‘ ~ ('0 q 7.5;; ()61407‘“?! (is, J a ’{dJo 4"” rim“ CN/ CHEM 171 PRACTICE FlNAL 7 FALL PAGE: I 10.(20points) 3. Wu gawk-mmch close-packodsmnmwimadensityofls wacflwmm , of '1me . ccf: FOL ” M's Kfi)4(%} : tuck/“h, 3—“ - van 1. W) a “w @ 0 V v "n- XIOtitiuv/‘W "a! d LflI/l) m Vl’fl :43 0 " * NM.“ 4"“ r-YZ X10 In v . r'n >: AI; - b. What are No methods for forming solid Krypton? Free“ 57¢ch 1+ c. Do you expect solid Krypton to be brittl or mall le? Why? 6?,qu (lull. ’4‘ J Wok". 3‘ clot [It/ml flow [Illa Mv (MIA 1*"? ‘ d. What color should solid Krypton bc? clmv Inga? [47A ‘QM (IQZV e. Can nypton form compounds? Please cxPlajn_ ,y.--41LL'°"L +1.4 float y yejlj (at Aci’IWNLL ’5 4 MA CM ,[9 L 412 dye, ’fOW (“PL CHEM 171 PRAchE F|NAL - FALL 4 new ” u. (20points)AC11eml7lsmdentfoundtwoelecumficmataialsmdwmtedmexplondieirpmpeifies. Elemtalmalysisindicatedfliateachwasmsdeupofonlyoneelement Pordtefirstmatetialthe phomelecuon spectroscopy indicatedsp3 hybtidization. Measming conductivity (0) vs. temperature (T) gave finefollowingplot: lg o WfiT Hr lowT' a. Draw the band stmctme of the first material. Label valence band (V .B.). conduction (C.B.). HOMO, LUMZ’MW “fift’w (WKWY " ’W‘“"“’" "' “M an» g”- M E vflA b. What molecular orbitals form the V.B.? - o’ (Fm 1,3 4.0.1] c. What molecular orbitals form the C.B.? aw? d. What chemical methods could you use to increase the conductivity (0)? two ‘ texamples. ave] av daft (Ho/N" e. Howwouldeachefffiéeplotofzvsm myjb"! uni,“ (74' 0'3"“ l I I The second materiglot of 0 vs. T gave: fl LEM ° / ‘ ’ Mm . hails W ("T f. What type of elmaterial is this? g. Pnedict the size of Eg for the second material. 0 . h. Predict the magnetic properties ex ted for this material. 71/ 4m]. infiyewwt ,4qu M“ m ‘ CHEM 171 PRACTICE FINAL -— FALL PAGE 10 ' ' 12. (14 points) 3. Describe the structure and magnetic properties of the following compounds: i. [N104]? Pd(NH )2(CN)2 Pt(PH3) "32.21: HS”) pa“ 4'} 1.1.1.1roflev4" #4106“ '0 b 7.51%. ‘rp ' W7” 23? A k 40 IMM’N' b 4231, 44- . 24$”) wannajVA‘L b. Which is mostlikelytoappearmin solutiop? y? "0% our“, M4," W M n“ if - 6' a“;ng M, W I. d' What is the “1°” fikfily color of the remaining complex? . ' “(fl/{w 9U" :41 Alum! {Mr/117m] __,._. . CHEM 171 PRACTICE FINAL — FALL _ — PAGE 11 13.(20poinls)Youamaskedmsynfl1eaizcfitemoststablesaltpossiblebasedonfltedatagiveninthetablesbelow (all radii givenbtAngstram). [L pmcmm Manna-hauledmdil(l)dca;lpk§M x' 1.33 Ca“ 0.99 so: 2.30 Mac; 2.40- M00} 2.54 \ Rb‘ 1.4a st“ 1.13 ca; 2.36 M.” 2.45 SbO.‘ 2.60 Cs’ 1.69 Ba" 1.25 PO.’ _2.38 M0} 2.4: Bio: 2.68 on, 3.40 o: 1.30 co: 1.35 N0; 1.55 cw 1.52 N0; 1.39 . l” at 2+ Y;— M ML?ka av";— fl Which saltdoyous thesize? Why? '9 a or!) - 3 L . Inwhatsitesarethecati mostlikelytobefoxmd? . no!“ L. Joann («’1' 0.11: 2, “2 4‘ V" ' »—-—, :7 .1 773; M (M £1 altar) Based on your newer in part b, what is most likely coordination number of the ani 2 14‘ aka u t (an!) r Hun. J» 1-3 .c ‘w 4'“ a, 9A, Calculate the lattice energy of the salt you choose, given that A = 2.75, n = 9. L u 1W (x -i) - (2.706.0m10‘90969“WW: r h _ vH-c « .L‘ 9 An anion's radius cannot not be easily measured, however, determining ionization potential. electron affinitymdheatsofformationarereadilydoneinthe .Giventhisinfoxmationhowwerethe radii of the anions determined considering that they are called "thermochemical radii?" +‘" c C’L 4L» (alibi/Q10 M vvquq I +11, dawn twin/‘1‘» A!!!“ ...
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Key_PracticeFinal_Fall2008 - CHEM 171 PRACTICE FINAL - FALF...

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